For over 30 years, our Refinery Services business, operating as TDC, has been a leading producer of sodium hydrosulfide (NaHS). ...

Our Refinery Services business, operating as TDC, is a leading supplier of caustic soda (NaOH). ...

Sulfur Services, doing business as TDC, provides engineering, logistics, and technical services to our refinery and petrochemical customers. ...

Refinery Services, doing business as TDC, supplies NaHS to a wide range of end markets. ...